Hide behind the chopper until the other monsters stop appearing, usually I estimate about
15-25 of them, try to save grenades and the ammo for your big machine gun, use either your
Desert Eagle handguns if you have them and shoot them in the head, try to save the armor
until the other stop jumping down. Once the others stop coming, a meteroid or rock from
the volcano will balst him from his perch a few minutes later, so dont even bother wasting
ammo at him until he does come down.
The assault rifle with its grenades are the most effective way to kill him, but if you can
the other machine gun off the chopper, all the ammo you need to kill him is there, but the
remaining machine gun is on the side of the chopper he can see.
Once Crowe is down on the ground, he will walk way out in front of the chopper to where
you had arrived in the elevator, go to the other side of the chopper and fire a couple of
the rockets at his *** and if all else come to push and shove, use all your ammo of
everything you got and try to keep the chopper or rocks between you and him.
FYI move very fast when you break cover to go get ammp, never try to attack him with your
bare hands, it seems to have no effect except to lower your adrenaline and make you a
closer target.
Kepp trying, you'll get him.